Kinetic Molecular Theory

AP Chemistry· difficulty 4/5

Helium effuses how many times faster than CH4_4 through a small hole at the same temperature?

  • A

    4\sqrt{4} = 2 times (Graham's law)

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  • B

    2 times

  • C

    16/4\sqrt{16/4} = 2 times

  • D

    4 times

Explanation

Graham's law: r1/r2=M2/M1r_1/r_2 = \sqrt{M_2/M_1}. He = 4, CH4_4 = 16. Ratio = 16/4\sqrt{16/4} = 2.

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